Cryogenic refrigerator compressor with externally adjustable by-pass/relief valve

(19)

(11)

EP 0 236 018 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	10.04.1991 Bulletin 1991/15

(43)	Date of publication A2:
	09.09.1987 Bulletin 1987/37

(21)	Application number: 87301456.7

(22)	Date of filing: 19.02.1987

(51)	International Patent Classification (IPC)⁴: F16K 17/04, F25B 41/04, F25B 9/00

(84)	Designated Contracting States:
	CH DE FR GB IT LI NL

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Priority:

27.02.1986 US 834201

(71)	Applicant: HELIX TECHNOLOGY CORPORATION
	Waltham Massachusetts 02254 (US)

(72)	Inventor:
	Nicoll, Harry G. Norwell Massachusetts 02061 (US)

(74)	Representative: Pendlebury, Anthony et al
	PAGE, WHITE & FARRER 54 Doughty Street London WC1N 2LS London WC1N 2LS (GB)

(56)

References cited: :

(54)	Cryogenic refrigerator compressor with externally adjustable by-pass/relief valve

(57) A cryogenic refrigeration compressor which has externally adjustable in-line pressure relief valve positioned between a helium supply line and the helium return line. The valve has coaxial inlet and outlet members (46, 42) and an externally adjustable spring compression spring compression member (44), which together they define a duct (48), within which is a poppet valve (76), and a spring (64) which exerts bias against the valve to close the valve against fluid pressures. The spring (64) is compressed by rotation of the compression member (44) to vary the bias on the poppet valve (44).

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